. >> chevy chase mother jennifer emmett makes sure her children get their annual flu st. when the h1n1 virus started spreading last Ñiyear, the seasonal flu vac couldn't protect all three of her children from getting sick. >> it's pret hard on a family of five of kids this young. they're so on top of each other. and it is, when someone brings something home, it is almost impossible not to have it spread through the family. >> now refers at the national institutes of health are trying to develop a new type of flu vac. one that could ma those annual seasonal flu shots the thing of the past. >> insteadof you having to get a new vaccine every year, we would like the develop a vaccine where could you get a shot, one or two or three times when you're very young and would it last you a lifetime and protect against the vario different strains of flu that would you encounter. >> reporter: he is the director ofaccine research. he said this ne type of universal flu shot would be similar to the measles vaccine that's children get now. that's c)jz could t now. provide a lifetimef pro